#region License

/* Copyright (c) 2005 Leslie Sanford
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#endregion

#region Contact

/*
 * Leslie Sanford
 * Email: jabberdabber@hotmail.com
 */

#endregion

using System.Runtime.InteropServices;

namespace Sanford.Multimedia.Midi
{
    /// <summary>
    /// The base class for all MIDI devices.
    /// </summary>
    public abstract class MidiDevice : Device
    {
        #region MidiDevice Members

        #region Win32 Midi Device Functions

        [DllImport("winmm.dll")]
        private static extern int midiConnect(IntPtr handleA, IntPtr handleB, IntPtr reserved);         

        [DllImport("winmm.dll")]
        private static extern int midiDisconnect(IntPtr handleA, IntPtr handleB, IntPtr reserved);             

        #endregion

        // Size of the MidiHeader structure.
        protected static readonly int SizeOfMidiHeader;

        static MidiDevice()
        {
            SizeOfMidiHeader = Marshal.SizeOf(typeof(MidiHeader));
        }

        public MidiDevice(int deviceID) : base(deviceID)
        {            
        }
        
        /// <summary>
        /// Connects a MIDI InputDevice to a MIDI thru or OutputDevice, or 
        /// connects a MIDI thru device to a MIDI OutputDevice. 
        /// </summary>
        /// <param name="handleA">
        /// Handle to a MIDI InputDevice or a MIDI thru device (for thru 
        /// devices, this handle must belong to a MIDI OutputDevice).
        /// </param>
        /// <param name="handleB">
        /// Handle to the MIDI OutputDevice or thru device.
        /// </param>
        /// <exception cref="DeviceException">
        /// If an error occurred while connecting the two devices.
        /// </exception>
        public static void Connect(IntPtr handleA, IntPtr handleB)
        {
            int result = midiConnect(handleA, handleB, IntPtr.Zero);

            if(result != DeviceException.MMSYSERR_NOERROR)
            {
                throw new MidiDeviceException(result);
            }
        }

        /// <summary>
        /// Disconnects a MIDI InputDevice from a MIDI thru or OutputDevice, or 
        /// disconnects a MIDI thru device from a MIDI OutputDevice. 
        /// </summary>
        /// <param name="handleA">
        /// Handle to a MIDI InputDevice or a MIDI thru device.
        /// </param>
        /// <param name="handleB">
        /// Handle to the MIDI OutputDevice to be disconnected. 
        /// </param>
        /// <exception cref="DeviceException">
        /// If an error occurred while disconnecting the two devices.
        /// </exception>
        public static void Disconnect(IntPtr handleA, IntPtr handleB)
        {
            int result = midiDisconnect(handleA, handleB, IntPtr.Zero);

            if(result != DeviceException.MMSYSERR_NOERROR)
            {
                throw new MidiDeviceException(result);
            }
        }        

        #endregion        
    }
}